1646042155 has 8 divisors (see below), whose sum is σ = 1976781312. Its totient is φ = 1315813248.

The previous prime is 1646042141. The next prime is 1646042159. The reversal of 1646042155 is 5512406461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646042155 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646042155.

It is not an unprimeable number, because it can be changed into a prime (1646042159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120427 + ... + 133396.

It is an arithmetic number, because the mean of its divisors is an integer number (247097664).

Almost surely, 2^1646042155 is an apocalyptic number.

1646042155 is a deficient number, since it is larger than the sum of its proper divisors (330739157).

1646042155 is a wasteful number, since it uses less digits than its factorization.

1646042155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255125.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1646042155 is about 40571.4450691616. The cubic root of 1646042155 is about 1180.7201758580.

The spelling of 1646042155 in words is "one billion, six hundred forty-six million, forty-two thousand, one hundred fifty-five".